English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the thermalization of a small $XX$ chain coupled to long, gapped$XXZ$ leads at either side by observing the relaxation dynamics of the wholesystem. Using extensive tensor network simulations, we show that such systems,although not integrable, appear to show either extremely slow thermalization oreven lack thereof since the two can not be distinguished within the accuracy ofour numerics. We show that the persistent oscillations observed in the spincurrent in the middle of the $XX$ chain are related to eigenstates of theentire system located within the gap of the boundary chains. We find from exactdiagonalization that some of these states remain strictly localized within the$XX$ chain and do not hybridize with the rest of the system. The frequencies ofthe persistent oscillations determined by numerical simulations of dynamicsmatch the energy differences between these states exactly. This has importantimplications for open systems, where the strongly interacting leads are oftenassumed to thermalize the central system. Our results suggest that if we employgapped systems for the leads, this assumption does not hold; this finding isparticularly relevant to any potential future experimental studies of openquantum systems.

Absence of thermalization of free systems coupled to gapped interacting reservoirs